grep …………… search for a string in a file
tail …………… show the last few lines of a file
who ……………. shows who is logged into the local system
w ……………… shows who is logged on and what they’re doing
finger (emailaddr).. shows more information about a user
df …………….. shows disk space available on the system
du …………….. shows how much disk space is being used up by folders
chmod ………….. changes permissions on a file
bc …………….. a simple calculator